At present, producing acrylonitrile mainly uses the process of propylene ammoxidation.Study on the catalyst of propylene ammoxidation is the key to this process.是什么意思_At present, producing acrylonitrile mainly uses the process of propylene ammoxidation.Study on the catalyst of propylene ammoxidation is the key to this process.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句